WO2021073973A2 - Organic printed circuit board, transmission having an organic printed circuit board, and production method for producing an organic printed circuit board - Google Patents

Organic printed circuit board, transmission having an organic printed circuit board, and production method for producing an organic printed circuit board Download PDF

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Publication number
WO2021073973A2
WO2021073973A2 PCT/EP2020/078101 EP2020078101W WO2021073973A2 WO 2021073973 A2 WO2021073973 A2 WO 2021073973A2 EP 2020078101 W EP2020078101 W EP 2020078101W WO 2021073973 A2 WO2021073973 A2 WO 2021073973A2
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WO
WIPO (PCT)
Prior art keywords
circuit board
organic
printed circuit
pressure sensor
pressure
Prior art date
Application number
PCT/EP2020/078101
Other languages
German (de)
French (fr)
Other versions
WO2021073973A3 (en
Inventor
Johannes Hofmann
Simon Porscha
Bernhard Schuch
Original Assignee
Vitesco Technologies Germany Gmbh
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Application filed by Vitesco Technologies Germany Gmbh filed Critical Vitesco Technologies Germany Gmbh
Publication of WO2021073973A2 publication Critical patent/WO2021073973A2/en
Publication of WO2021073973A3 publication Critical patent/WO2021073973A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0005—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using variations in capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0061—Electrical connection means
    • G01L19/0069—Electrical connection means from the sensor to its support
    • G01L19/0076—Electrical connection means from the sensor to its support using buried connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G01L19/0645—Protection against aggressive medium in general using isolation membranes, specially adapted for protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance

Definitions

  • Organic printed circuit board gears with an organic printed circuit board, and manufacturing method for manufacturing an organic printed circuit board
  • sensors are increasingly being used.
  • these sensors form a basis for the functioning of a wide variety of systems.
  • For the operation of a transmission for example, it is important to know the current pressure value of the transmission oil inside the transmission housing. Different sensor concepts are used for this.
  • an electrical signal caused by deformation of a piezoelectric element is used as a measure of the pressure acting on the piezoelectric element.
  • Capacitive pressure sensors are also used in which, for example, a ceramic substrate is provided with an electrode layer formed from a metal and a membrane, which is also usually ceramic and is also provided with an electrode layer, is arranged opposite this. When the membrane is deflected, a capacitance of a plate capacitor formed by the two electrode layers changes.
  • sensors with so-called strain gauges can also be used.
  • strain gauge (s) are also arranged on a membrane, the pressure-related deformation of which can be recorded by means of the strain gauges and converted into the applied pressure with knowledge of the mechanical properties of the membrane.
  • sensors with electroactive polymers are also used, with the electroactive polymers having to be protected from the gear oil environment with its sometimes aggressive environmental properties by a housing.
  • the object is therefore to propose an organic printed circuit board with a pressure sensor, which is improved compared to an organic printed circuit board with sensors known from the prior art and, in particular, has more flexibility and / or a smaller overall size.
  • a further object is to propose a transmission with such an organic printed circuit board and a production method for producing such an organic printed circuit board.
  • An organic printed circuit board is proposed with an organic substrate comprising several layers and at least one polymeric pressure sensor embedded in the intermediate layers of the organic substrate for measuring the pressure of a fluid.
  • the pressure sensor comprises a polymer film and two electrode layers, the electrode layers being arranged on the opposite outer surfaces of the polymer film.
  • the two electrode layers with the polymer film in between form a capacitor.
  • the external pressure can be determined by measuring the capacitance of the capacitor or the electrical properties of the capacitor that are related to the capacitance of the capacitor. So that such a measurement can be carried out, the pressure sensor is connected to electrically conductive inner layers of the organic substrate by means of electrodes.
  • a separating membrane seals the pressure sensor from the fluid space surrounding the organic circuit board in a media-tight manner. This ensures that the pressure sensor does not come into contact with the partially aggressive fluids that are in the fluid space.
  • the fact that a polymer pressure sensor is embedded in the organic circuit board also gives the organic circuit board its flexibility. By embedding the polymer pressure sensor in the organic circuit board, a housing for the pressure sensor can also be dispensed with, so that no flexibility is lost here either. In addition, a particularly space-saving design is possible with such an embedded pressure sensor.
  • the polymer film is advantageously formed from silicone. Silicone is a flexible material and can withstand heavy use.
  • the electrode layers are formed from an electrically conductive material, in particular carbon black or graphite paste.
  • This electrically conductive material is arranged on both outer surfaces of the polymer film.
  • carbon black or graphite paste are very flexible, so they do not impair the flexibility of the pressure sensor and also withstand frequent deformations.
  • the electrode layers can be formed from a polymer filled with conductive particles.
  • graphene or carbon nanotubes come into consideration as conductive particles. Flexibility is also guaranteed in this case.
  • the polymer which is filled with the conductive particles is particularly preferably the same material as the polymer film. Then the properties in terms of flexibility and thermal expansion of the electrode layers and the polymer film are the same, whereby the occurrence of stresses between the electrode layers and the polymer film is suppressed.
  • the separating membrane is made of metal. Suitable metal can withstand the aggressive fluids in the fluid space.
  • a thin metal separating membrane also has the preferred flexibility and can transmit the pressure of the fluid to the pressure sensor in a well-defined manner. Because the separating membrane is itself placed under tension by an applied pressure, the pressure transmitted to the pressure sensor is generally less than the pressure that the fluid exerts on the separating membrane.
  • the separating membrane advantageously has a three-dimensional structure, the three-dimensional structure in particular comprising beads in the edge region of the separating membrane.
  • the transmission of the pressure exerted by the fluid to the pressure sensor is further influenced by the three-dimensional structure. If beads are arranged in the edge area of the separating membrane, then deformation of the separating membrane occurs preferably in this area and the inner area of the The separating membrane, which transmits the pressure to the pressure sensor, moves plane-parallel, which means that the pressure is transmitted even better.
  • the electrodes are designed as micro-vias, by sintering, soldering and / or by means of conductive adhesive.
  • a via is a through-hole connection (Vertical Interconnect Access).
  • the exact configuration of the electrodes depends, among other things, on the conductive layers of the organic circuit board and on the configuration of the electrode layers of the pressure sensor.
  • the organic circuit board comprises a frame, in particular made of epoxy, for fixing and / or pretensioning the pressure sensor.
  • the pressure sensor is therefore fixed in the intermediate layers of the organic substrate by means of the frame, so that the pressure sensor is located at a predetermined position in the organic circuit board.
  • Pre-tensioning the pressure sensor also improves the response of the pressure sensor to changing pressures, so that an even more precise measurement of the pressures is made possible.
  • the organic printed circuit board advantageously comprises a pressure channel which fluidly connects the fluid space with the separating membrane. Fluid reaches the separating membrane via this pressure channel, so that the pressure of the fluid is applied to the separating membrane.
  • the organic printed circuit board comprises a pressure transmitter for transmitting the pressure from the separating membrane to the pressure sensor.
  • the pressure of the fluid applied to the separating membrane is transmitted to the pressure sensor via this pressure transmitter.
  • a possible pressure mediator is a bolt, whereby the length and the cross section of the bolt can be adapted as required.
  • Another possible pressure mediator is a, preferably largely incompressible, mediating fluid that transfers the pressure from the separating membrane to the pressure sensor evenly.
  • an evaluation unit connected to the pressure sensor for evaluating the electrical properties of the pressure sensor is integrated on the organic printed circuit board.
  • These electrical properties can be directly the capacitance of the pressure sensor, but also electrical properties that are dependent on the capacitance of the pressure sensor. Since the capacitance or the electrical properties, which are dependent on the capacitance, of the pressure sensor with the am Pressure sensor applied pressure are correlated, the evaluation unit is used to determine the pressure acting on the pressure sensor. Integration of the evaluation unit on the organic circuit board also requires a smaller and more compact design.
  • the evaluation unit is advantageously designed to determine the fluid pressure prevailing in the fluid space from the electrical properties of the pressure sensor. This takes place on the basis of the evaluated electrical properties of the pressure sensor, in particular by means of a characteristic curve.
  • the characteristic curve is an assignment of the electrical property of the pressure sensor, for example the capacitance of the pressure sensor, to the fluid pressure prevailing in the fluid space.
  • This characteristic curve already contains the mechanical data and effects of the separating membrane and the pressure transmitter as well as the deformation of the pressure sensor due to the pressure and the dependence of the capacity of the pressure sensor due to this deformation, so no complicated calculations have to be carried out.
  • the organic circuit board is designed to measure at least one fluid pressure prevailing in a transmission interior.
  • the organic circuit board also offers flexibility and a small size. The organic circuit board can therefore be used in many places in the transmission and it is possible to reduce the size, and thus also the weight, of the transmission.
  • a transmission control unit for controlling at least one transmission function is integrated on the organic printed circuit board.
  • This transmission function is preferably dependent on a fluid pressure that is present in the transmission chamber and is measured by means of the pressure sensor. The fluid pressure is measured by the pressure sensor and evaluated by the evaluation unit. The result of this evaluation is forwarded directly to the transmission control unit, so that all of the electronics are integrated in an organic circuit board.
  • the pressure sensor is embedded in the intermediate layers of the organic substrate as a functional unit when the organic substrate is built up.
  • at least one layer of the organic substrate is first built up.
  • the pressure sensor is placed on this at least one layer, preferably in a frame.
  • One or more intermediate layers surrounding the pressure sensor are then built up around the pressure sensor.
  • at least one further layer is built up that closes the pressure sensor at the top.
  • the built-up organic circuit board is exposed to predetermined fluid pressures and the electrical properties of the pressure sensor are used to generate a characteristic curve at these predetermined fluid pressures.
  • the fully assembled organic circuit board is therefore calibrated with the specified fluid pressures. It is possible to generate a separate characteristic curve for each organic printed circuit board, or to use a characteristic curve determined for a specific organic printed circuit board for the other identically structured organic printed circuit boards. Using the characteristic curve, the prevailing fluid pressure is then calculated from the electrical properties of the pressure sensor during operation of the organic circuit board.
  • FIG. 1 shows a longitudinal section through a first exemplary embodiment of an organic printed circuit board with an embedded pressure sensor
  • FIG. 2 shows a longitudinal section through a further exemplary embodiment of an organic printed circuit board with an embedded pressure sensor.
  • FIG. 1 shows a longitudinal section through a first exemplary embodiment of an organic printed circuit board 1 with an embedded pressure sensor 2.
  • the organic printed circuit board 1 comprises a plurality of layers 3.
  • the pressure sensor 2 is embedded in one of the intermediate layers 4 of the organic substrate. It is also conceivable that the pressure sensor 2 extends over several intermediate layers 4.
  • the pressure sensor 2 has a polymer film 5, which is preferably made of silicone.
  • Two electrode layers 6 are arranged on the two opposite outer surfaces of the polymer film 5.
  • the electrode layers 6 can for example consist of a conductive material such as carbon black or graphite paste, but can also be formed from a polymer filled with conductive particles. For example, graphene or carbon nanotubes come into consideration as conductive particles.
  • the polymer of the electrode layer 6 is particularly preferably the same material as the polymer film 5, so that effects due to different coefficients of thermal expansion are reduced to a minimum.
  • the electrode layers 6 are connected to electrically conductive inner layers 8 of the organic substrate by means of electrodes 7.
  • the electrodes 7 are designed as micro-vias, but can also be formed by sintering, soldering and / or by means of conductive adhesive. Electrical properties of the pressure sensor 2, in particular the capacitance of the capacitor formed by the two electrode layers 6 and the polymer film 5, or electrical properties dependent on this capacitance, are determined via the electrodes 7. Since a deformation of the polymer film 5 occurs when pressure is exerted on the pressure sensor 2, which results in a change in the capacitance of the pressure sensor 2, the pressure acting on the pressure sensor can be determined via the measured electrical properties of the pressure sensor 2.
  • a characteristic curve is preferably recorded which relates the pressure prevailing outside to the measured electrical property of the pressure sensor 2.
  • this characteristic curve On the basis of this characteristic curve, during operation of the organic circuit board 1 with the pressure sensor 2, conclusions can be drawn from the measured electrical properties of the pressure sensor 2 about the external pressure, without major calculations.
  • an optional but preferred evaluation unit which evaluates the electrical properties of the pressure sensor 2 and uses the characteristic curve to determine the external pressure.
  • the pressure sensor 2 itself is fixed and prestressed in a frame 9, preferably made of epoxy. By fixing the pressure sensor 2 is always on one predetermined position. The preloading of the pressure sensor 2 improves the accuracy of the determination of the external pressure.
  • the pressure sensor 2 is sealed off from the fluid space 11 surrounding the organic printed circuit board 1 in a media-tight manner via a separating membrane 10.
  • the separating membrane 10 is preferably made of metal. In its edge area it comprises beads 12 which give it a three-dimensional structure. As a result, the deformation of the separating membrane 10 when a pressure is applied is shifted to the edge regions of the separating membrane 10. In the central area of the separating membrane 10, when pressure is applied, there is a predominantly plane-parallel displacement.
  • the pressure of the fluid space 11 surrounding the organic printed circuit board 1 is conveyed to the separating membrane 10 via a pressure channel 13.
  • the separating membrane 10 then forwards this pressure to the pressure sensor 2 by means of a pressure transmitter 14, which is designed here as a bolt.
  • the length and cross-section of the bolt can be adapted to the required conditions.
  • FIG. 2 shows a longitudinal section through a further exemplary embodiment of an organic printed circuit board 1 with an embedded pressure sensor 2.
  • the separating membrane 10 of this exemplary embodiment has no beads 12.
  • the pressure mediator 14 is not designed as a bolt, but rather as a preferably incompressible mediation fluid. As a result, the pressure is transmitted from the separating membrane 10 to the pressure sensor 2 in a particularly uniform manner.
  • An organic printed circuit board 1 with an embedded pressure sensor 2 is in a transmission, not shown here.
  • the pressure sensor 2 measures the fluid pressure prevailing in a transmission interior.
  • a transmission control unit which controls one or more functions of the transmission as a function of the measured fluid pressure, is advantageously also integrated on the organic printed circuit board.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Measuring Fluid Pressure (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)

Abstract

The invention relates to an organic printed circuit board (1) having an organic substrate comprising a plurality of layers (3), and having at least one polymeric pressure sensor (2) embedded into the interlayers (4) of the organic substrate, for measuring the pressure of a fluid. In this case, the pressure sensor (2) comprises a polymer film (5) and two electrode layers (6), wherein the electrode layers (6) are arranged on the opposite outer surfaces of the polymer film (5), wherein the pressure sensor (2) is linked to electrically conductive inner layers (8) of the organic substrate by means of electrodes (7), and wherein a separating membrane (10) seals the pressure sensor (2) media-tightly from the fluid space (11) surrounding the organic printed circuit board (1). Furthermore, a transmission having an organic printed circuit board (1) according to the preceding description for measuring at least one fluid pressure prevailing in an interior of the transmission, and a production method for producing an organic printed circuit board (1) according to the preceding description are proposed, wherein in the course of constructing the organic substrate the pressure sensor (2) is embedded as a functional unit into the interlayers (4) of the organic substrate.

Description

Beschreibung description
Organische Leiterplatte, Getriebe mit einer organischen Leiterplatte und Herstellungsverfahren zum Herstellen einer organischen Leiterplatte Organic printed circuit board, gears with an organic printed circuit board, and manufacturing method for manufacturing an organic printed circuit board
Vorgeschlagen wird eine organische Leiterplatte mit einem mehrere Lagen umfassenden organischen Substrat und einem Drucksensor, ein Getriebe mit einer organischen Leiterplatte sowie ein Herstellungsverfahren zum Herstellen einer organischen Leiterplatte. What is proposed is an organic printed circuit board with an organic substrate comprising several layers and a pressure sensor, a transmission with an organic printed circuit board and a production method for producing an organic printed circuit board.
Unter anderem im Bereich der Fahrzeugtechnik kommen vermehrt Sensoren zum Einsatz. Beispielsweise bilden diese Sensoren eine Grundlage für die Funktion unterschiedlichster Systeme. Für den Betrieb eines Getriebes ist zum Beispiel die Kenntnis eines aktuellen Druckwerts des Getriebeöls innerhalb des Getriebegehäuses wichtig. Hierfür kommen unterschiedliche Sensor-Konzepte zum Einsatz. In the field of vehicle technology, among other things, sensors are increasingly being used. For example, these sensors form a basis for the functioning of a wide variety of systems. For the operation of a transmission, for example, it is important to know the current pressure value of the transmission oil inside the transmission housing. Different sensor concepts are used for this.
Bei auf dem Piezo-Effekt beruhenden Drucksensoren wird beispielsweise ein durch eine Verformung eines piezo-elektrischen Elements hervorgerufenes elektrisches Signal als Maß für den auf das Piezo-Element wirkenden Druck herangezogen. Weiter kommen auch kapazitive Drucksensoren zum Einsatz, bei denen beispielsweise ein keramisches Substrat mit einer aus einem Metall gebildeten Elektrodenschicht versehen ist und in Gegenüberstellung zu dieser eine meist ebenfalls keramische Membran angeordnet ist, die auch mit einer Elektrodenschicht versehen ist. Bei einer Auslenkung der Membran ändert sich mithin eine Kapazität eines durch die beiden Elektrodenschichten gebildeten Plattenkondensators. Als weitere Option können auch Sensoren mit sogenannten Dehnungsmessstreifen zum Einsatz kommen. Bei diesen sind der oder die Dehnungsmessstreifen ebenfalls auf einer Membran angeordnet, deren druckbedingte Deformation mittels der Dehnungsmessstreifen erfasst und in Kenntnis der mechanischen Eigenschaften der Membran in den anliegenden Druck umgerechnet werden kann. Schließlich werden auch Sensoren mit elektroaktiven Polymeren eingesetzt, wobei die elektroaktiven Polymere durch ein Gehäuse von der Getriebeöl-Umgebung mit ihren teilweise aggressiven Umwelteigenschaften geschützt werden müssen. In the case of pressure sensors based on the piezo effect, for example, an electrical signal caused by deformation of a piezoelectric element is used as a measure of the pressure acting on the piezoelectric element. Capacitive pressure sensors are also used in which, for example, a ceramic substrate is provided with an electrode layer formed from a metal and a membrane, which is also usually ceramic and is also provided with an electrode layer, is arranged opposite this. When the membrane is deflected, a capacitance of a plate capacitor formed by the two electrode layers changes. As a further option, sensors with so-called strain gauges can also be used. In these, the strain gauge (s) are also arranged on a membrane, the pressure-related deformation of which can be recorded by means of the strain gauges and converted into the applied pressure with knowledge of the mechanical properties of the membrane. Finally, sensors with electroactive polymers are also used, with the electroactive polymers having to be protected from the gear oil environment with its sometimes aggressive environmental properties by a housing.
Aufgrund seines Gehäuses ist der Platzbedarf der genannten Sensoren vorgegeben und kann somit nicht anwenderspezifisch modifiziert werden. Außerdem sind die meisten der genannten Sensoren bzw. ihre Gehäuse starr und somit unflexibel. An sich flexible organische Leiterplatten mit einem oder mehreren der genannten Sensoren verlieren daher zumindest teilweise ihre Flexibilität und gewinnen durch den Platzbedarf der Sensoren an Größe. Due to its housing, the space requirements of the sensors mentioned are specified and can therefore not be modified in a user-specific manner. In addition, most of the sensors mentioned or their housing are rigid and thus inflexible. Organic circuit boards that are flexible per se with one or more of the sensors mentioned therefore lose at least some of their flexibility and gain in size due to the space requirements of the sensors.
Die Aufgabe ist es daher, eine organische Leiterplatte mit einem Drucksensor vorzuschlagen, die im Vergleich zu einer organischen Leiterplatte mit aus dem Stand der Technik bekannten Sensoren verbessert ist und insbesondere mehr Flexibilität und/oder eine kleinere Baugröße aufweist. Des Weiteren ist es die Aufgabe, ein Getriebe mit einer derartigen organischen Leiterplatte sowie ein Herstellungsverfahren zum Herstellen einer derartigen organischen Leiterplatte vorzuschlagen. The object is therefore to propose an organic printed circuit board with a pressure sensor, which is improved compared to an organic printed circuit board with sensors known from the prior art and, in particular, has more flexibility and / or a smaller overall size. A further object is to propose a transmission with such an organic printed circuit board and a production method for producing such an organic printed circuit board.
Diese Aufgabe wird gelöst durch eine Organische Leiterplatte mit einem Drucksensor gemäß Patentanspruch 1 , ein Getriebe mit einer organischen Leiterplatte gemäß Patentanspruch 12 und ein Herstellungsverfahren zum Herstellen einer organischen Leiterplatte gemäß Patentanspruch 14. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche, der folgenden Beschreibung sowie der Figuren. This object is achieved by an organic circuit board with a pressure sensor according to claim 1, a transmission with an organic circuit board according to claim 12 and a manufacturing method for producing an organic circuit board according to claim 14. Advantageous embodiments are the subject of the dependent claims, the following description and the figures .
Vorgeschlagen wird eine organische Leiterplatte mit einem mehrere Lagen umfassenden organischen Substrat und zumindest einem in die Zwischenlagen des organischen Substrats eingebetteten polymeren Drucksensor zur Messung des Drucks eines Fluids. Dabei umfasst der Drucksensor eine Polymerfolie und zwei Elektrodenschichten, wobei die Elektrodenschichten an den gegenüberliegenden Außenflächen der Polymerfolie angeordnet sind. Die beiden Elektrodenschichten mit der dazwischenliegenden Polymerfolie bilden einen Kondensator. Bei Anlegen eines äußeren Drucks auf den Drucksensor verformt sich die Polymerfolie und damit ändert sich die Kapazität des Kondensators. Über eine Messung der Kapazität des Kondensators beziehungsweise mit der Kapazität des Kondensators zusammenhängenden elektrischen Eigenschaften des Kondensators kann der äußere Druck bestimmt werden. Damit eine solche Messung durchgeführt werden kann ist der Drucksensor mittels Elektroden an elektrisch leitende Innenlagen des organischen Substrats angebunden. Schließlich schließt eine Trennmembran den Drucksensor von dem die organische Leiterplatte umgebenden Fluidraum mediendicht ab. So wird gewährleistet, dass der Drucksensor nicht mit den teilweise aggressiven Fluiden in Kontakt kommt, die sich im Fluidraum befinden. Dadurch, dass ein polymerer Drucksensor in die organische Leiterplatte eingebettet ist, ist auch die Flexibilität der organischen Leiterplatte gegeben. Durch das Einbetten des polymeren Drucksensors in die organische Leiterplatte kann zudem auf ein Gehäuse für den Drucksensor verzichtet werden, so dass auch hier keine Flexibilität verloren geht. Zudem ist mit einem solchen eingebetteten Drucksensor eine besonders platzsparende Bauweise möglich. An organic printed circuit board is proposed with an organic substrate comprising several layers and at least one polymeric pressure sensor embedded in the intermediate layers of the organic substrate for measuring the pressure of a fluid. The pressure sensor comprises a polymer film and two electrode layers, the electrode layers being arranged on the opposite outer surfaces of the polymer film. The two electrode layers with the polymer film in between form a capacitor. When an external pressure is applied to the pressure sensor, the polymer film is deformed and thus the capacitance of the capacitor changes. The external pressure can be determined by measuring the capacitance of the capacitor or the electrical properties of the capacitor that are related to the capacitance of the capacitor. So that such a measurement can be carried out, the pressure sensor is connected to electrically conductive inner layers of the organic substrate by means of electrodes. Finally, a separating membrane seals the pressure sensor from the fluid space surrounding the organic circuit board in a media-tight manner. This ensures that the pressure sensor does not come into contact with the partially aggressive fluids that are in the fluid space. The fact that a polymer pressure sensor is embedded in the organic circuit board also gives the organic circuit board its flexibility. By embedding the polymer pressure sensor in the organic circuit board, a housing for the pressure sensor can also be dispensed with, so that no flexibility is lost here either. In addition, a particularly space-saving design is possible with such an embedded pressure sensor.
Vorteilhafterweise ist die Polymerfolie aus Silikon gebildet. Silikon ist dabei ein flexibles Material und hält starken Beanspruchungen Stand. The polymer film is advantageously formed from silicone. Silicone is a flexible material and can withstand heavy use.
Es ist von Vorteil, wenn die Elektrodenschichten aus einem elektrisch leitfähigen Material, insbesondere Ruß oder Graphitpaste, gebildet sind. Dieses elektrisch leitfähige Material ist auf beiden Außenflächen der Polymerfolie angeordnet. Zudem sind Ruß oder Graphitpaste sehr flexibel, beeinträchtigen damit nicht die Flexibilität des Drucksensors und halten auch häufigen Verformungen Stand. Alternativ oder zusätzlich zum elektrisch leitfähigen Material können die Elektrodenschichten aus einem mit leitfähigen Partikeln gefülltem Polymer gebildet sein. Als leitfähigen Partikel kommen dabei insbesondere Graphen oder Kohlenstoffnanoröhren in Betracht. Auch in diesem Fall ist die Flexibilität gewährleistet. Besonders vorzugsweise ist das Polymer, das mit den leitfähigen Partikeln gefüllt ist, das gleiche Material wie die Polymerfolie. Dann sind die Eigenschaften hinsichtlich Flexibilität und Temperaturausdehnung von den Elektrodenschichten und der Polymerfolie gleich, wodurch das Auftreten von Spannungen zwischen den Elektrodenschichten und der Polymerfolie unterdrückt wird. It is advantageous if the electrode layers are formed from an electrically conductive material, in particular carbon black or graphite paste. This electrically conductive material is arranged on both outer surfaces of the polymer film. In addition, carbon black or graphite paste are very flexible, so they do not impair the flexibility of the pressure sensor and also withstand frequent deformations. As an alternative or in addition to the electrically conductive material, the electrode layers can be formed from a polymer filled with conductive particles. In particular, graphene or carbon nanotubes come into consideration as conductive particles. Flexibility is also guaranteed in this case. The polymer which is filled with the conductive particles is particularly preferably the same material as the polymer film. Then the properties in terms of flexibility and thermal expansion of the electrode layers and the polymer film are the same, whereby the occurrence of stresses between the electrode layers and the polymer film is suppressed.
Vorteilhaft ist es, wenn die Trennmembran aus Metall gebildet ist. Geeignetes Metall kann dabei den im Fluidraum befindlichen aggressiven Fluiden Stand halten. Eine dünne Trennmembran aus Metall besitzt zudem auch die bevorzugte Flexibilität und kann den Druck des Fluids wohldefiniert an den Drucksensor weiterleiten. Dadurch, dass die Trennmembran von einem angelegten Druck selbst unter Spannung gesetzt wird, ist der an den Drucksensor weitergeleitete Druck in der Regel kleiner als der Druck, den das Fluid auf die Trennmembran ausübt. It is advantageous if the separating membrane is made of metal. Suitable metal can withstand the aggressive fluids in the fluid space. A thin metal separating membrane also has the preferred flexibility and can transmit the pressure of the fluid to the pressure sensor in a well-defined manner. Because the separating membrane is itself placed under tension by an applied pressure, the pressure transmitted to the pressure sensor is generally less than the pressure that the fluid exerts on the separating membrane.
Vorteilhafterweise weist die Trennmembran eine dreidimensionale Struktur auf, wobei die dreidimensionale Struktur insbesondere Sicken im Randbereich der Trennmembran umfasst. Durch die dreidimensionale Struktur wird die Weitergabe des von dem Fluid ausgeübten Drucks an den Drucksensor weiter beeinflusst. Sind im Randbereich der Trennmembran Sicken angeordnet, dann tritt eine Verformung der Trennmembran bevorzugt in diesem Bereich auf und der innere Bereich der Trennmembran, der den Druck an den Drucksensor weitergibt, bewegt sich planparallel, was eine noch besser definierte Weitergabe des Drucks bedingt. The separating membrane advantageously has a three-dimensional structure, the three-dimensional structure in particular comprising beads in the edge region of the separating membrane. The transmission of the pressure exerted by the fluid to the pressure sensor is further influenced by the three-dimensional structure. If beads are arranged in the edge area of the separating membrane, then deformation of the separating membrane occurs preferably in this area and the inner area of the The separating membrane, which transmits the pressure to the pressure sensor, moves plane-parallel, which means that the pressure is transmitted even better.
Es ist von Vorteil, wenn die Elektroden als Mikro-Vias, durch Sintern, Löten und/oder mittels Leitkleber ausgebildet sind. Ein Via ist dabei eine Durchkontaktierung (Vertical Interconnect Access). Die genaue Ausgestaltung der Elektroden hängt dabei unter anderem von den leitenden Schichten der organischen Leiterplatte und von der Ausgestaltung der Elektrodenschichten des Drucksensors ab. It is advantageous if the electrodes are designed as micro-vias, by sintering, soldering and / or by means of conductive adhesive. A via is a through-hole connection (Vertical Interconnect Access). The exact configuration of the electrodes depends, among other things, on the conductive layers of the organic circuit board and on the configuration of the electrode layers of the pressure sensor.
Vorteilhaft ist es, wenn die organische Leiterplatte einen Rahmen, insbesondere aus Epoxy, umfasst, zum Fixieren und/oder Vorspannen des Drucksensors. Mittels des Rahmens wird der Drucksensor also in den Zwischenlagen des organischen Substrats fixiert, so dass sich der Drucksensor an einer vorgegebenen Position in der organischen Leiterplatte befindet. Ein Vorspannen des Drucksensors verbessert zudem die Reaktion des Drucksensors auf sich ändernde Drücke, so dass eine noch genauere Messung der Drücke ermöglicht wird. It is advantageous if the organic circuit board comprises a frame, in particular made of epoxy, for fixing and / or pretensioning the pressure sensor. The pressure sensor is therefore fixed in the intermediate layers of the organic substrate by means of the frame, so that the pressure sensor is located at a predetermined position in the organic circuit board. Pre-tensioning the pressure sensor also improves the response of the pressure sensor to changing pressures, so that an even more precise measurement of the pressures is made possible.
Vorteilhafterweise umfasst die organische Leiterplatte einen Druckkanal, der den Fluidraum fluidisch mit der Trennmembran verbindet. Über diesen Druckkanal gelangt Fluid zur Trennmembran, so dass der Druck des Fluids an der Trennmembran anliegt. The organic printed circuit board advantageously comprises a pressure channel which fluidly connects the fluid space with the separating membrane. Fluid reaches the separating membrane via this pressure channel, so that the pressure of the fluid is applied to the separating membrane.
Es ist von Vorteil, wenn die organische Leiterplatte einen Druckvermittler zur Übertragung des Drucks von der Trennmembran auf den Drucksensor umfasst. Der an der Trennmembran anliegende Druck des Fluids wird über diesen Druckvermittler auf den Drucksensor übertragen. Ein möglicher Druckvermittler ist dabei ein Bolzen, wobei die Länge und der Querschnitt des Bolzens nach Bedarf angepasst werden können. Ein weiterer möglicher Druckvermittler ist ein, vorzugsweise weitgehend inkompressibles, Vermittlungsfluid, das den Druck von der Trennmembran gleichmäßig an den Drucksensor weitergibt. It is advantageous if the organic printed circuit board comprises a pressure transmitter for transmitting the pressure from the separating membrane to the pressure sensor. The pressure of the fluid applied to the separating membrane is transmitted to the pressure sensor via this pressure transmitter. A possible pressure mediator is a bolt, whereby the length and the cross section of the bolt can be adapted as required. Another possible pressure mediator is a, preferably largely incompressible, mediating fluid that transfers the pressure from the separating membrane to the pressure sensor evenly.
Vorteilhaft ist es, wenn auf der organischen Leiterplatte eine mit dem Drucksensor verbundene Auswerteeinheit zum Auswerten der elektrischen Eigenschaften des Drucksensors integriert ist. Diese elektrischen Eigenschaften können direkt die Kapazität des Drucksensors aber auch von der Kapazität des Drucksensors abhängige elektrische Eigenschaften sein. Da die Kapazität oder die von der Kapazität abhängigen elektrischen Eigenschaften des Drucksensors mit dem am Drucksensor anliegenden Druck korreliert sind, dient die Auswerteeinheit dem Bestimmen des auf den Drucksensor wirkenden Drucks. Eine Integration der Auswerteeinheit auf der organischen Leiterplatte bedingt zudem eine kleinere und kompaktere Bauform. It is advantageous if an evaluation unit connected to the pressure sensor for evaluating the electrical properties of the pressure sensor is integrated on the organic printed circuit board. These electrical properties can be directly the capacitance of the pressure sensor, but also electrical properties that are dependent on the capacitance of the pressure sensor. Since the capacitance or the electrical properties, which are dependent on the capacitance, of the pressure sensor with the am Pressure sensor applied pressure are correlated, the evaluation unit is used to determine the pressure acting on the pressure sensor. Integration of the evaluation unit on the organic circuit board also requires a smaller and more compact design.
Vorteilhafterweise ist die Auswerteeinheit dazu ausgebildet, aus den elektrischen Eigenschaften des Drucksensors den im Fluidraum herrschenden Fluiddruck zu bestimmen. Dies erfolgt auf Grund der ausgewerteten elektrischen Eigenschaften des Drucksensors, insbesondere mittels einer Kennlinie. Die Kennlinie ist dabei eine Zuordnung der elektrischen Eigenschaft des Drucksensors, beispielsweise der Kapazität des Drucksensors, zu dem im Fluidraum herrschenden Fluiddruck. In dieser Kennlinie sind die mechanischen Daten und Wirkungen der Trennmembran und des Druckvermittlers sowie die Verformung des Drucksensors auf Grund des Drucks und die Abhängigkeit der Kapazität des Drucksensors auf Grund dieser Verformung schon enthalten, es müssen also keine komplizierten Berechnungen durchgeführt werden. The evaluation unit is advantageously designed to determine the fluid pressure prevailing in the fluid space from the electrical properties of the pressure sensor. This takes place on the basis of the evaluated electrical properties of the pressure sensor, in particular by means of a characteristic curve. The characteristic curve is an assignment of the electrical property of the pressure sensor, for example the capacitance of the pressure sensor, to the fluid pressure prevailing in the fluid space. This characteristic curve already contains the mechanical data and effects of the separating membrane and the pressure transmitter as well as the deformation of the pressure sensor due to the pressure and the dependence of the capacity of the pressure sensor due to this deformation, so no complicated calculations have to be carried out.
Des Weiteren wird ein Getriebe mit einer organischen Leiterplatte nach der vorangegangenen Beschreibung vorgeschlagen. Die organische Leiterplatte ist dabei zum Messen von zumindest einem in einem Getriebeinnenraum herrschenden Fluiddruck ausgebildet. Die organische Leiterplatte bietet darüber hinaus Flexibilität sowie eine geringe Baugröße. Die organische Leiterplatte kann daher an vielen Stellen im Getriebe eingesetzt werden und es ist möglich, die Baugröße, und damit auch das Gewicht, des Getriebes zu verringern. Furthermore, a transmission with an organic printed circuit board according to the preceding description is proposed. The organic circuit board is designed to measure at least one fluid pressure prevailing in a transmission interior. The organic circuit board also offers flexibility and a small size. The organic circuit board can therefore be used in many places in the transmission and it is possible to reduce the size, and thus also the weight, of the transmission.
Es ist von Vorteil, wenn auf der organischen Leiterplatte eine Getriebesteuereinheit zum Steuern von zumindest einer Getriebefunktion integriert ist. Diese Getriebefunktion ist dabei vorzugsweise von einem mittels des Drucksensors gemessenen im Getrieberaum herrschenden Fluiddrucks abhängig. Der Fluiddruck wird dabei von dem Drucksensor gemessen und von der Auswerteeinheit ausgewertet. Das Ergebnis dieser Auswertung wird direkt an die Getriebesteuereinheit weitergeleitet, so dass diese gesamte Elektronik in einer organischen Leiterplatte integriert ist. Neben einer geringen Baugröße ist hierbei auch von Vorteil, dass die Anzahl der externen elektrischen Kontakte, die vom teilweise aggressiven Fluid abgeschirmt sein müssen, verringert ist. It is advantageous if a transmission control unit for controlling at least one transmission function is integrated on the organic printed circuit board. This transmission function is preferably dependent on a fluid pressure that is present in the transmission chamber and is measured by means of the pressure sensor. The fluid pressure is measured by the pressure sensor and evaluated by the evaluation unit. The result of this evaluation is forwarded directly to the transmission control unit, so that all of the electronics are integrated in an organic circuit board. In addition to its small size, it is also advantageous that the number of external electrical contacts that have to be shielded from the sometimes aggressive fluid is reduced.
Ferner wird ein Herstellungsverfahren zum Herstellen einer organischen Leiterplatte nach der vorangegangenen Beschreibung vorgeschlagen. Dabei wird der Drucksensor beim Aufbau des organischen Substrats als funktionale Einheit in die Zwischenlagen des organischen Substrats eingebettet. Insbesondere wird zunächst zumindest eine Lage des organischen Substrats aufgebaut. Auf diese zumindest eine Lage wird der Drucksensor, vorzugweise in einem Rahmen, aufgesetzt. Um den Drucksensor herum werden sodann eine oder mehrere den Drucksensor umschließende Zwischenlagen aufgebaut. Schließlich wird zumindest eine weitere Lage aufgebaut, die den Drucksensor nach oben hin abschließt. Furthermore, a production method for producing an organic printed circuit board according to the preceding description is proposed. It will the pressure sensor is embedded in the intermediate layers of the organic substrate as a functional unit when the organic substrate is built up. In particular, at least one layer of the organic substrate is first built up. The pressure sensor is placed on this at least one layer, preferably in a frame. One or more intermediate layers surrounding the pressure sensor are then built up around the pressure sensor. Finally, at least one further layer is built up that closes the pressure sensor at the top.
Vorteilhaft ist es, wenn die aufgebaute organische Leiterplatte vorgegebenen Fluiddrücken ausgesetzt wird und die elektrischen Eigenschaften des Drucksensors bei diesen vorgegebenen Fluiddrücken zur Erzeugung einer Kennlinie verwendet werden. Die fertig aufgebaute organische Leiterplatte wird also mit den vorgegebenen Fluiddrücken kalibriert. Dabei ist es möglich, für jede organische Leiterplatte eine eigene Kennlinie zu erzeugen, oder eine für eine bestimmte organische Leiterplatte ermittelte Kennlinie für die weiteren identisch aufgebauten organischen Leiterplatten zu verwenden. Mittels der Kennlinie wird dann im Betrieb der organischen Leiterplatte aus den elektrischen Eigenschaften des Drucksensors der herrschende Fluiddruck berechnet. It is advantageous if the built-up organic circuit board is exposed to predetermined fluid pressures and the electrical properties of the pressure sensor are used to generate a characteristic curve at these predetermined fluid pressures. The fully assembled organic circuit board is therefore calibrated with the specified fluid pressures. It is possible to generate a separate characteristic curve for each organic printed circuit board, or to use a characteristic curve determined for a specific organic printed circuit board for the other identically structured organic printed circuit boards. Using the characteristic curve, the prevailing fluid pressure is then calculated from the electrical properties of the pressure sensor during operation of the organic circuit board.
Nachfolgend werden Ausführungsbeispiele einer organischen Leiterplatte mit einem Drucksensor anhand einer Zeichnung näher dargestellt. Darin zeigen: In the following, exemplary embodiments of an organic printed circuit board with a pressure sensor are shown in greater detail on the basis of a drawing. Show in it:
Fig. 1 einen Längsschnitt durch ein erstes Ausführungsbeispiel einer organischen Leiterplatte mit einem eingebetteten Drucksensor und 1 shows a longitudinal section through a first exemplary embodiment of an organic printed circuit board with an embedded pressure sensor and
Fig. 2 einen Längsschnitt durch ein weiteres Ausführungsbeispiel einer organischen Leiterplatte mit einem eingebetteten Drucksensor. 2 shows a longitudinal section through a further exemplary embodiment of an organic printed circuit board with an embedded pressure sensor.
Einander entsprechende Teile sind in allen Figuren stets mit gleichen Bezugszeichen versehen. Corresponding parts are always provided with the same reference symbols in all figures.
Figur 1 zeigt einen Längsschnitt durch ein erstes Ausführungsbeispiel einer organischen Leiterplatte 1 mit einem eingebetteten Drucksensor 2. Die organische Leiterplatte 1 umfasst dabei eine Mehrzahl an Lagen 3. In eine der Zwischenlagen 4 des organischen Substrats ist der Drucksensor 2 eingebettet. Dabei ist es auch denkbar, dass sich der Drucksensor 2 über mehrere Zwischenlagen 4 erstreckt. Der Drucksensor 2 weist dabei eine Polymerfolie 5 auf, die bevorzugt aus Silikon besteht. Auf den beiden gegenüberliegenden Außenflächen der Polymerfolie 5 sind dabei zwei Elektrodenschichten 6 angeordnet. Die Elektrodenschichten 6 können dabei beispielsweise aus einem leitfähigen Material, wie zum Beispiel Ruß oder Graphitpaste, bestehen, können aber auch aus einem mit leitfähigen Partikeln gefülltem Polymer gebildet sein. Als leitfähige Partikel kommen dabei beispielsweise Graphen oder Kohlenstoffnanoröhrchen in Betracht. Besonders bevorzugt ist das Polymer der Elektrodenschicht 6 das gleiche Material wie die Polymerfolie 5, so dass sich Effekte durch unterschiedliche Wärmeausdehnungskoeffizienten auf ein Minimum reduzieren. FIG. 1 shows a longitudinal section through a first exemplary embodiment of an organic printed circuit board 1 with an embedded pressure sensor 2. The organic printed circuit board 1 comprises a plurality of layers 3. The pressure sensor 2 is embedded in one of the intermediate layers 4 of the organic substrate. It is also conceivable that the pressure sensor 2 extends over several intermediate layers 4. The pressure sensor 2 has a polymer film 5, which is preferably made of silicone. Two electrode layers 6 are arranged on the two opposite outer surfaces of the polymer film 5. The electrode layers 6 can for example consist of a conductive material such as carbon black or graphite paste, but can also be formed from a polymer filled with conductive particles. For example, graphene or carbon nanotubes come into consideration as conductive particles. The polymer of the electrode layer 6 is particularly preferably the same material as the polymer film 5, so that effects due to different coefficients of thermal expansion are reduced to a minimum.
Die Elektrodenschichten 6 sind mittels Elektroden 7 an elektrisch leitende Innenlagen 8 des organischen Substrats angebunden. Die Elektroden 7 sind im vorliegenden Ausführungsbeispiel als Mikro-Vias ausgebildet, können aber auch durch Sintern, Löten und/oder mittels Leitkleber gebildet werden. Über die Elektroden 7 werden elektrische Eigenschaften des Drucksensors 2, insbesondere die Kapazität des durch die beiden Elektrodenschichten 6 und die Polymerfolie 5 gebildeten Kondensators oder von dieser Kapazität abhängige elektrische Eigenschaften bestimmt. Da bei Ausübung eines Drucks auf den Drucksensor 2 eine Verformung der Polymerfolie 5 auftritt, die eine Änderung der Kapazität des Drucksensors 2 zur Folge hat, lässt sich über die gemessenen elektrischen Eigenschaften des Drucksensors 2 der auf den Drucksensor wirkende Druck bestimmen. The electrode layers 6 are connected to electrically conductive inner layers 8 of the organic substrate by means of electrodes 7. In the present exemplary embodiment, the electrodes 7 are designed as micro-vias, but can also be formed by sintering, soldering and / or by means of conductive adhesive. Electrical properties of the pressure sensor 2, in particular the capacitance of the capacitor formed by the two electrode layers 6 and the polymer film 5, or electrical properties dependent on this capacitance, are determined via the electrodes 7. Since a deformation of the polymer film 5 occurs when pressure is exerted on the pressure sensor 2, which results in a change in the capacitance of the pressure sensor 2, the pressure acting on the pressure sensor can be determined via the measured electrical properties of the pressure sensor 2.
Vorzugsweise wird zur Bestimmung des Drucks eine Kennlinie aufgenommen, die den außen herrschenden Druck mit der gemessenen elektrischen Eigenschaft des Drucksensors 2 in Zusammenhang bringt. Anhand dieser Kennlinie kann dann im Betrieb der organischen Leiterplatte 1 mit dem Drucksensor 2, ohne größere Berechnungen, von den gemessenen elektrischen Eigenschaften des Drucksensors 2 auf den außen anliegenden Druck geschlossen werden. To determine the pressure, a characteristic curve is preferably recorded which relates the pressure prevailing outside to the measured electrical property of the pressure sensor 2. On the basis of this characteristic curve, during operation of the organic circuit board 1 with the pressure sensor 2, conclusions can be drawn from the measured electrical properties of the pressure sensor 2 about the external pressure, without major calculations.
In der Figur nicht gezeigt ist eine optionale, aber bevorzugte Auswerteeinheit, die die elektrischen Eigenschaften des Drucksensors 2 auswertet und über die Kennlinie den außen anliegenden Druck bestimmt. Not shown in the figure is an optional but preferred evaluation unit which evaluates the electrical properties of the pressure sensor 2 and uses the characteristic curve to determine the external pressure.
Der Drucksensor 2 selbst ist in einem Rahmen 9, vorzugsweise aus Epoxy, fixiert und vorgespannt. Durch das Fixieren befindet sich der Drucksensor 2 stets an einer vorbestimmten Position. Das Vorspannen des Drucksensors 2 verbessert dabei die Genauigkeit der Bestimmung des außen anliegenden Drucks. The pressure sensor 2 itself is fixed and prestressed in a frame 9, preferably made of epoxy. By fixing the pressure sensor 2 is always on one predetermined position. The preloading of the pressure sensor 2 improves the accuracy of the determination of the external pressure.
Über eine Trennmembran 10 ist der Drucksensor 2 von dem die organische Leiterplatte 1 umgebenden Fluidraum 11 mediendicht abgeschlossen. Die Trennmembran 10 ist dabei vorzugsweise aus Metall gebildet. Sie umfasst in ihrem Randbereich Sicken 12, die ihr eine dreidimensionale Struktur verleihen. Hierdurch wird die Verformung der Trennmembran 10 beim Einwirken eines Drucks an die Randbereiche der Trennmembran 10 verlagert. Im zentralen Bereich der Trennmembran 10 erfolgt bei einwirkendem Druck eine vorwiegend planparallele Verschiebung. The pressure sensor 2 is sealed off from the fluid space 11 surrounding the organic printed circuit board 1 in a media-tight manner via a separating membrane 10. The separating membrane 10 is preferably made of metal. In its edge area it comprises beads 12 which give it a three-dimensional structure. As a result, the deformation of the separating membrane 10 when a pressure is applied is shifted to the edge regions of the separating membrane 10. In the central area of the separating membrane 10, when pressure is applied, there is a predominantly plane-parallel displacement.
Der Druck des die organische Leiterplatte 1 umgebenden Fluidraums 11 wird dabei über einen Druckkanal 13 an die Trennmembran 10 geleitet. Die Trennmembran 10 leitet diesen Druck dann mittels eines Druckvermittlers 14, der hier als Bolzen ausgebildet ist, an den Drucksensor 2 weiter. Der Bolzen kann dabei in seiner Länge und seinem Querschnitt an die benötigten Bedingungen angepasst werden. The pressure of the fluid space 11 surrounding the organic printed circuit board 1 is conveyed to the separating membrane 10 via a pressure channel 13. The separating membrane 10 then forwards this pressure to the pressure sensor 2 by means of a pressure transmitter 14, which is designed here as a bolt. The length and cross-section of the bolt can be adapted to the required conditions.
Figur 2 zeigt einen Längsschnitt durch ein weiteres Ausführungsbeispiel einer organischen Leiterplatte 1 mit einem eingebetteten Drucksensor 2. Im Vergleich zum Ausführungsbeispiel der Figur 1 weist die Trennmembran 10 dieses Ausführungsbeispiels keine Sicken 12 auf. FIG. 2 shows a longitudinal section through a further exemplary embodiment of an organic printed circuit board 1 with an embedded pressure sensor 2. In comparison to the exemplary embodiment in FIG. 1, the separating membrane 10 of this exemplary embodiment has no beads 12.
Des Weiteren ist der Druckvermittler 14 nicht als Bolzen, sondern als vorzugsweise inkompressibles Vermittlungsfluid ausgestaltet. Hierdurch wird der Druck von der Trennmembran 10 besonders gleichmäßig auf den Drucksensor 2 übertragen. Furthermore, the pressure mediator 14 is not designed as a bolt, but rather as a preferably incompressible mediation fluid. As a result, the pressure is transmitted from the separating membrane 10 to the pressure sensor 2 in a particularly uniform manner.
Eine mögliche Anwendung einer organischen Leiterplatte 1 mit einem eingebetteten Drucksensor 2 ist in einem hier nicht dargestellten Getriebe. Der Drucksensor 2 misst dann den in einem Getriebeinnenraum herrschenden Fluiddruck. Vorteilhafterweise ist auf der organischen Leiterplatte noch eine Getriebesteuereinheit integriert, die in Abhängigkeit vom gemessenen Fluiddruck eine oder mehrere Funktionen des Getriebes steuert. One possible application of an organic printed circuit board 1 with an embedded pressure sensor 2 is in a transmission, not shown here. The pressure sensor 2 then measures the fluid pressure prevailing in a transmission interior. A transmission control unit, which controls one or more functions of the transmission as a function of the measured fluid pressure, is advantageously also integrated on the organic printed circuit board.
Der vorgeschlagene Gegenstand ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Vielmehr können weitere Ausführungsformen von dem Fachmann aus der vorstehenden Beschreibung und im Rahmen der Patentansprüche abgeleitet werden. Insbesondere können die anhand der verschiedenen Ausführungsbeispiele beschriebenen Einzelmerkmale auch in anderer Weise miteinander kombiniert werden. The proposed subject matter is not limited to the exemplary embodiments described above. Rather, further embodiments can be derived by a person skilled in the art from the above description and within the scope of the patent claims. In particular, based on the Individual features described in various exemplary embodiments can also be combined with one another in a different manner.
Bezugszeichenliste List of reference symbols
1 organische Leiterplatte 1 organic circuit board
2 Drucksensor 3 Lage 2 pressure sensor 3 position
4 Zwischenlage 4 liner
5 Polymerfolie 5 polymer film
6 Elektrodenschicht 6 electrode layer
7 Elektrode 8 elektrisch leitende Innenlage7 electrode 8 electrically conductive inner layer
9 Rahmen 9 frames
10 Trennmembran 10 separating membrane
11 Fluidraum 11 fluid space
12 Sicke 13 Druckkanal 12 bead 13 pressure channel
14 Druckvermittler 14 Print intermediaries

Claims

Patentansprüche Claims
1. Organische Leiterplatte mit einem mehrere Lagen (3) umfassenden organischen Substrat und zumindest einem in die Zwischenlagen (4) des organischen Substrats eingebetteten polymeren Drucksensor (2) zur Messung des Drucks eines Fluids, wobei der Drucksensor (2) eine Polymerfolie (5) und zwei Elektrodenschichten (6) umfasst, wobei die Elektrodenschichten (6) an den gegenüberliegenden Außenflächen der Polymerfolie (5) angeordnet sind, wobei der Drucksensor (2) mittels Elektroden (7) an elektrisch leitende Innenlagen (8) des organischen Substrats angebunden ist und wobei eine Trennmembran (10) den Drucksensor (2) von dem die organische Leiterplatte (1 ) umgebenden Fluidraum (11 ) mediendicht abschließt. 1. Organic printed circuit board with an organic substrate comprising several layers (3) and at least one polymeric pressure sensor (2) embedded in the intermediate layers (4) of the organic substrate for measuring the pressure of a fluid, the pressure sensor (2) being a polymer film (5) and comprises two electrode layers (6), the electrode layers (6) being arranged on the opposite outer surfaces of the polymer film (5), the pressure sensor (2) being connected to electrically conductive inner layers (8) of the organic substrate by means of electrodes (7) and wherein a separating membrane (10) seals the pressure sensor (2) from the fluid space (11) surrounding the organic circuit board (1) in a media-tight manner.
2. Organische Leiterplatte nach Anspruch 1 , wobei die Polymerfolie (5) aus Silikon gebildet ist. 2. Organic printed circuit board according to claim 1, wherein the polymer film (5) is formed from silicone.
3. Organische Leiterplatte nach Anspruch 1 oder 2, wobei die Elektrodenschichten3. Organic printed circuit board according to claim 1 or 2, wherein the electrode layers
(6) aus einem elektrisch leitfähigen Material, insbesondere Ruß oder Graphitpaste, und/oder aus einem mit leitfähigen Partikeln gefülltem Polymer gebildet sind, wobei die leitfähigen Partikel insbesondere Graphen oder Kohlenstoffnanoröhren sind und das Polymer insbesondere das gleiche Material wie die Polymerfolie (5) ist. (6) are formed from an electrically conductive material, in particular carbon black or graphite paste, and / or from a polymer filled with conductive particles, the conductive particles being in particular graphene or carbon nanotubes and the polymer in particular being the same material as the polymer film (5) .
4. Organische Leiterplatte nach einem der Ansprüche 1 bis 3, wobei die Trennmembran (10) aus Metall gebildet ist. 4. Organic printed circuit board according to one of claims 1 to 3, wherein the separating membrane (10) is formed from metal.
5. Organische Leiterplatte nach einem der Ansprüche 1 bis 4, wobei die Trennmembran (10) eine dreidimensionale Struktur aufweist, wobei die dreidimensionale Struktur insbesondere Sicken (12) im Randbereich der Trennmembran (10) umfasst. 5. Organic printed circuit board according to one of claims 1 to 4, wherein the separating membrane (10) has a three-dimensional structure, the three-dimensional structure in particular comprising beads (12) in the edge region of the separating membrane (10).
6. Organische Leiterplatte nach einem der Ansprüche 1 bis 5, wobei die Elektroden6. Organic circuit board according to one of claims 1 to 5, wherein the electrodes
(7) als Mikro-Vias, durch Sintern, Löten und/oder mittels Leitkleber ausgebildet sind. (7) are designed as micro-vias, by sintering, soldering and / or by means of conductive adhesive.
7. Organische Leiterplatte nach einem der Ansprüche 1 bis 6, wobei die organische Leiterplatte (1 ) einen Rahmen (9), insbesondere aus Epoxy, umfasst, zum Fixieren und/oder Vorspannen des Drucksensors (2). 7. Organic printed circuit board according to one of claims 1 to 6, wherein the organic printed circuit board (1) comprises a frame (9), in particular made of epoxy, for fixing and / or pretensioning the pressure sensor (2).
8. Organische Leiterplatte nach einem der Ansprüche 1 bis 7, wobei die organische Leiterplatte (1 ) einen Druckkanal (13) umfasst, der den Fluidraum (11 ) fluidisch mit der Trennmembran (10) verbindet. 8. Organic circuit board according to one of claims 1 to 7, wherein the organic circuit board (1) comprises a pressure channel (13) which fluidly connects the fluid space (11) to the separating membrane (10).
9. Organische Leiterplatte nach einem der Ansprüche 1 bis 8, wobei die organische Leiterplatte (1 ) einen Druckvermittler (14), insbesondere einen Bolzen oder ein Vermittlungsfluid, zur Übertragung des Drucks von der Trennmembran (10) auf den Drucksensor (2) umfasst. 9. Organic circuit board according to one of claims 1 to 8, wherein the organic circuit board (1) comprises a pressure transmitter (14), in particular a bolt or a communication fluid, for transmitting the pressure from the separating membrane (10) to the pressure sensor (2).
10. Organische Leiterplatte nach einem der Ansprüche 1 bis 9, wobei auf der organischen Leiterplatte (1 ) eine mit dem Drucksensor (2) verbundene Auswerteeinheit zum Auswerten der elektrischen Eigenschaften des Drucksensors (2) integriert ist. 10. Organic printed circuit board according to one of claims 1 to 9, wherein an evaluation unit connected to the pressure sensor (2) for evaluating the electrical properties of the pressure sensor (2) is integrated on the organic printed circuit board (1).
11 . Organische Leiterplatte nach Anspruch 10, wobei die Auswerteeinheit dazu ausgebildet ist, aus den elektrischen Eigenschaften des Drucksensors (2), insbesondere mittels einer Kennlinie, den im Fluidraum (11 ) herrschenden Fluiddruck zu bestimmen. 11. Organic printed circuit board according to Claim 10, the evaluation unit being designed to determine the fluid pressure prevailing in the fluid space (11) from the electrical properties of the pressure sensor (2), in particular by means of a characteristic curve.
12. Getriebe mit einer organischen Leiterplatte (1 ) nach einem der Ansprüche 1 bis 11 zum Messen von zumindest einem in einem Getriebeinnenraum herrschenden Fluiddruck. 12. Transmission with an organic printed circuit board (1) according to one of claims 1 to 11 for measuring at least one fluid pressure prevailing in a transmission interior.
13. Getriebe nach Anspruch 12, wobei auf der organischen Leiterplatte (1 ) eine Getriebesteuereinheit zum Steuern von zumindest einer Getriebefunktion integriert ist. 13. Transmission according to claim 12, wherein a transmission control unit for controlling at least one transmission function is integrated on the organic printed circuit board (1).
14. Herstellungsverfahren zum Herstellen einer organischen Leiterplatte (1) nach einem der Ansprüche 1 bis 11 , wobei der Drucksensor (2) beim Aufbau des organischen Substrats als funktionale Einheit in die Zwischenlagen (4) des organischen Substrats eingebettet wird. 14. Manufacturing method for manufacturing an organic printed circuit board (1) according to one of claims 1 to 11, wherein the pressure sensor (2) is embedded as a functional unit in the intermediate layers (4) of the organic substrate during the construction of the organic substrate.
15. Herstellungsverfahren nach Anspruch 14, wobei die aufgebaute organische Leiterplatte (1 ) vorgegebenen Fluiddrücken ausgesetzt wird und die elektrischen Eigenschaften des Drucksensors (2) bei diesen vorgegebenen Fluiddrücken zur Erzeugung einer Kennlinie verwendet werden. 15. Manufacturing method according to claim 14, wherein the built-up organic circuit board (1) is exposed to predetermined fluid pressures and the electrical properties of the pressure sensor (2) are used at these predetermined fluid pressures to generate a characteristic curve.
PCT/EP2020/078101 2019-10-14 2020-10-07 Organic printed circuit board, transmission having an organic printed circuit board, and production method for producing an organic printed circuit board WO2021073973A2 (en)

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